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73ET/74ET/75ET USERS MANUAL EM-7353-0003B Rev.5
The R1M/R2M is connected to 7xET’s COM port via a straight RS-232C cable included in the product package.
Second and more R1M, up to 15 in total, can be connected via RS-485 twisted-pair cables as shown in Figure 1.5.2.
When the line between the R1M and the PC needs to be extended via RS-485, insert an RS-232C/RS-485 converter
(model: R2K-1) to prevent noise interference and connect the converter to the PC via a straight RS-232C cable.
If you need to connect an R2M module with an R1M module on the RS-485 network, use an RS-232C interlink/
reverse cable.
Figure 1.5.2: System configuration example for the R1M/R2M series.
RS-485, Modbus RTU
RS-232C
straight
RS-485
RS-232C
Interlink/reverse
R1M-GH2
DC/TC INPUTS
16 points
1 trigger input
R2K-1
R2M-2H3
TC INPUTS
8 points
7xET
R1M-J3
RTD/POT INPUTS
8 points
R1M-A1
CONTACT INPUTS
32 points
R1M-D1
CONTACT OUTPUTS
(open collector)
32 points
Содержание 75ET
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